@phdthesis{TUW-225459, author = {Hirschbichler, Michael}, title = {Denial-of-Service and Unsolicited Communcation Protection in Global Voice-over-IP Infrastructures}, school = {E389}, year = {2013}, url = {http://publik.tuwien.ac.at/files/PubDat_225459.pdf}, keywords = {Voice-over-IP, Spam, Unsolicited Communication, Denial of Service} }